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Commit2647ad6

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Fix alias-for-target-table-of-UPDATE-or-DELETE patch so that alias can
be any ColId other than 'SET', rather than only IDENT as originally.Per discussion.
1 parent1d763d9 commit2647ad6

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1 file changed

+25
-8
lines changed

1 file changed

+25
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‎src/backend/parser/gram.y‎

Lines changed: 25 additions & 8 deletions
Original file line numberDiff line numberDiff line change
@@ -11,7 +11,7 @@
1111
*
1212
*
1313
* IDENTIFICATION
14-
* $PostgreSQL: pgsql/src/backend/parser/gram.y,v 2.523 2006/01/2205:20:33 neilc Exp $
14+
* $PostgreSQL: pgsql/src/backend/parser/gram.y,v 2.524 2006/01/22 20:03:16 tgl Exp $
1515
*
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* HISTORY
1717
* AUTHORDATEMAJOR EVENT
@@ -429,6 +429,7 @@ static void doNegateFloat(Value *v);
429429
%token<ival>ICONSTPARAM
430430

431431
/* precedence: lowest to highest*/
432+
%nonassocSET/* see relation_expr_opt_alias*/
432433
%leftUNIONEXCEPT
433434
%leftINTERSECT
434435
%leftOR
@@ -5880,11 +5881,27 @@ relation_expr:
58805881
;
58815882

58825883

5883-
relation_expr_opt_alias: relation_expr
5884+
/*
5885+
* Given "UPDATE foo set set ...", we have to decide without looking any
5886+
* further ahead whether the first "set" is an alias or the UPDATE's SET
5887+
* keyword. Since "set" is allowed as a column name both interpretations
5888+
* are feasible. We resolve the shift/reduce conflict by giving the first
5889+
* relation_expr_opt_alias production a higher precedence than the SET token
5890+
* has, causing the parser to prefer to reduce, in effect assuming that the
5891+
* SET is not an alias.
5892+
*/
5893+
relation_expr_opt_alias: relation_expr%prec UMINUS
58845894
{
58855895
$$ =$1;
58865896
}
5887-
| relation_expr opt_as IDENT
5897+
| relation_expr ColId
5898+
{
5899+
Alias *alias = makeNode(Alias);
5900+
alias->aliasname =$2;
5901+
$1->alias = alias;
5902+
$$ =$1;
5903+
}
5904+
| relation_expr AS ColId
58885905
{
58895906
Alias *alias = makeNode(Alias);
58905907
alias->aliasname =$3;
@@ -6827,7 +6844,7 @@ a_expr:c_expr{ $$ = $1; }
68276844
$$ = (Node *) makeSimpleA_Expr(AEXPR_IN,"<>",$1,$4);
68286845
}
68296846
}
6830-
| a_expr subquery_Op sub_type select_with_parens%prec Op
6847+
| a_expr subquery_Op sub_type select_with_parens%prec Op
68316848
{
68326849
SubLink *n = makeNode(SubLink);
68336850
n->subLinkType =$3;
@@ -6836,14 +6853,14 @@ a_expr:c_expr{ $$ = $1; }
68366853
n->subselect =$4;
68376854
$$ = (Node *)n;
68386855
}
6839-
| a_expr subquery_Op sub_type'(' a_expr')'%prec Op
6856+
| a_expr subquery_Op sub_type'(' a_expr')'%prec Op
68406857
{
68416858
if ($3 == ANY_SUBLINK)
68426859
$$ = (Node *) makeA_Expr(AEXPR_OP_ANY,$2,$1,$5);
68436860
else
68446861
$$ = (Node *) makeA_Expr(AEXPR_OP_ALL,$2,$1,$5);
68456862
}
6846-
| UNIQUE select_with_parens %prec Op
6863+
| UNIQUE select_with_parens
68476864
{
68486865
/* Not sure how to get rid of the parentheses
68496866
* but there are lots of shift/reduce errors without them.
@@ -6901,7 +6918,7 @@ b_expr:c_expr
69016918
{$$ = (Node *) makeA_Expr(AEXPR_OP,$1,NULL,$2); }
69026919
| b_expr qual_Op%prec POSTFIXOP
69036920
{$$ = (Node *) makeA_Expr(AEXPR_OP,$2,$1,NULL); }
6904-
| b_expr IS DISTINCT FROM b_expr%prec IS
6921+
| b_expr IS DISTINCT FROM b_expr%prec IS
69056922
{
69066923
$$ = (Node *) makeSimpleA_Expr(AEXPR_DISTINCT,"=",$1,$5);
69076924
}
@@ -6910,7 +6927,7 @@ b_expr:c_expr
69106927
$$ = (Node *) makeA_Expr(AEXPR_NOT, NIL,
69116928
NULL, (Node *) makeSimpleA_Expr(AEXPR_DISTINCT,"=",$1,$6));
69126929
}
6913-
| b_expr IS OF'(' type_list')'%prec IS
6930+
| b_expr IS OF'(' type_list')'%prec IS
69146931
{
69156932
$$ = (Node *) makeSimpleA_Expr(AEXPR_OF,"=",$1, (Node *)$5);
69166933
}

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